Isoliquiritigenin isolated from the roots of Glycyrrhiza uralensis inhibits LPS-induced iNOS and COX-2 expression via the attenuation of NF-kappaB in RAW 264.7 macrophages - Kim, J Y; Park, S J; Yun, K J; Cho, Y W; Park, H J; Lee, K T (Eur J Pharmacol, 2008)